/*
Web App Template for Android 

Copyright (c) Microsoft Corporation

All rights reserved. 

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ""Software""), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

package com.microsoft.wat.Fragment;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;

import com.microsoft.wat.Adapter.NavigationExpandableListAdapter;
import com.microsoft.wat.Helper.Constants;
import com.microsoft.wat.Model.Config;
import com.microsoft.wat.Model.ConfigNavBarButtons;
import com.microsoft.wat.Model.ConfigNavBarChildButtons;
import com.microsoft.wat.R;
import com.microsoft.wat.WATActivity;
import com.microsoft.wat.WATApp;

import java.util.ArrayList;
import java.util.Arrays;

/**
 * Fragment used for managing interactions for and presentation of a navigation drawer.
 * See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction">
 * design guidelines</a> for a complete explanation of the behaviors implemented here.
 */
public class NavigationDrawerFragment extends Fragment {

    /**
     * Remember the position of the selected item.
     */
    private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";

    /**
     * Per the design guidelines, you should show the drawer on launch until the user manually
     * expands it. This shared preference tracks this.
     */
    private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";

    /**
     * A pointer to the current callbacks instance (the Activity).
     */
    private NavigationDrawerCallbacks mCallbacks;

    /**
     * Helper component that ties the action bar to the navigation drawer.
     */
    private ActionBarDrawerToggle mDrawerToggle;

    private DrawerLayout mDrawerLayout;
    private ExpandableListView mDrawerListView; // ListView
    private View mFragmentContainerView;

    private int mCurrentSelectedPosition = 0;
    private boolean mFromSavedInstanceState;
    private boolean mUserLearnedDrawer;

    private ArrayList<String> mGroups;
    private ArrayList<ArrayList<String>> mChildren;



    public NavigationDrawerFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getSections();

        // Read in the flag indicating whether or not the user has demonstrated awareness of the
        // drawer. See PREF_USER_LEARNED_DRAWER for details.
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
        mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

        if (savedInstanceState != null) {
            mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
            mFromSavedInstanceState = true;
        }

        // Select either the default item (0) or the last selected item.
        selectItem(mCurrentSelectedPosition); // landing page
    }

    @Override
    public void onResume() {
        super.onResume();
        IntentFilter filter = new IntentFilter();
        filter.addAction(Constants.BROADCAST_CONFIG_LOADED);
        getActivity().registerReceiver(receiver, filter);
    }

    @Override
    public void onPause() {
        super.onPause();
        getActivity().unregisterReceiver(receiver);
    }

    private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i(Constants.TAG, "Broadcast received");
            handleConfigReload();
        }
    };

    public void handleConfigReload() {
        ((WATApp) getActivity().getApplication()).getConfig();
        getSections();
        setListViewAdapter();
        if (!isDrawerOpen()) {
            ((WATActivity) getActivity()).setupActionBarOnRemoteLoad();
            ((WATActivity) getActivity()).endProgressIndicator();
        }
        selectItem(0);
    }

    private void getSections() {
        mGroups = new ArrayList<String>();
        mChildren = new ArrayList<ArrayList<String>>();
        Config config = ((WATApp) getActivity().getApplication()).getConfig();
        if( config != null && config.getNavBar() != null ) {
            for( ConfigNavBarButtons btn : config.getNavBar().getButtons() ) {
                // NB: 'back' and 'eval' not implemented
                //if ( ! btn.getAction().equalsIgnoreCase("back") && ! btn.getAction().equalsIgnoreCase("eval") ) {
                    ArrayList<String> children = new ArrayList<String>();
                    if ( btn.getAction().equalsIgnoreCase("nested") ) {
                        for( ConfigNavBarChildButtons childBtn : btn.getChildren() ) {
                            children.add(childBtn.getLabel());
                        }
                    }
                    mGroups.add( btn.getLabel() );
                    mChildren.add( children );
                //}
            }
        }
    }

    private String[][] convertStringArrayList( ArrayList<ArrayList<String>> listOfStringArrays ) {
        String[][] stringGroups = new String[listOfStringArrays.size()][];
        for ( int i=0; i<listOfStringArrays.size(); i++ ) {
            ArrayList<String> stringArray = listOfStringArrays.get(i);
            String[] stringsChildren = Arrays.copyOf(stringArray.toArray(), stringArray.toArray().length, String[].class);
            stringGroups[i] = stringsChildren;
        }
        return stringGroups;
    }

    @Override
    public void onActivityCreated (Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        // Indicate that this fragment would like to influence the set of actions in the action bar.
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mDrawerListView = (ExpandableListView) inflater.inflate(R.layout.fragment_navigation_drawer, container, false);

        ExpandableListView.OnChildClickListener childClickListener = new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                Log.i("CLICK", String.format("Clicked child #%d in group #%d", childPosition, groupPosition));
                selectItem(groupPosition, childPosition);
                return true;
            }
        };

        ExpandableListView.OnGroupClickListener groupClickListener = new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                int children = parent.getExpandableListAdapter().getChildrenCount(groupPosition);
                Log.i("CLICK", String.format("Clicked group #%d (with %d children)",groupPosition,children));
                if ( children==0 ) {
                    selectItem(groupPosition);
                    return true;
                } else {
                    return false;
                }
            }
        };

        mDrawerListView.setOnChildClickListener(childClickListener);
        mDrawerListView.setOnGroupClickListener(groupClickListener);

        setListViewAdapter();
        return mDrawerListView;
    }

    private void setListViewAdapter() {
        String[] groups = Arrays.copyOf(mGroups.toArray(), mGroups.toArray().length, String[].class);
        String[][] children = convertStringArrayList(mChildren);
        Config config = ((WATApp) getActivity().getApplication()).getConfig();
        if (config != null && config.getNavBar() != null) {
            NavigationExpandableListAdapter adapter = new NavigationExpandableListAdapter(
                    getActionBar().getThemedContext(), groups, children, config.getNavBar().getButtons());
            mDrawerListView.setAdapter(adapter);
            mDrawerListView.setGroupIndicator(null); // hides default expandable list indicator for single items
        }
    }

    public boolean isDrawerOpen() {
        return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
    }

    /**
     * Users of this fragment must call this method to set up the navigation drawer interactions.
     *
     * @param fragmentId   The android:id of this fragment in its activity's layout.
     * @param drawerLayout The DrawerLayout containing this fragment's UI.
     */
    public void setUp(int fragmentId, DrawerLayout drawerLayout) {
        mFragmentContainerView = getActivity().findViewById(fragmentId);
        mDrawerLayout = drawerLayout;

        // set a custom shadow that overlays the main content when the drawer opens
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        // set up the drawer's list view with items and click listener

        ActionBar actionBar = getActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions
        // between the navigation drawer and the action bar app icon.
        mDrawerToggle = new ActionBarDrawerToggle(
                getActivity(),                    /* host Activity */
                mDrawerLayout,                    /* DrawerLayout object */
                R.drawable.ic_drawer,             /* nav drawer image to replace 'Up' caret */
                R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
                R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
        ) {
            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                if (!isAdded()) {
                    return;
                }

                getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if (!isAdded()) {
                    return;
                }

                if (!mUserLearnedDrawer) {
                    // The user manually opened the drawer; store this flag to prevent auto-showing
                    // the navigation drawer automatically in the future.
                    mUserLearnedDrawer = true;
                    SharedPreferences sp = PreferenceManager
                            .getDefaultSharedPreferences(getActivity());
                    SharedPreferences.Editor editor = sp.edit();
                    editor.putBoolean(PREF_USER_LEARNED_DRAWER, true).commit();
                    editor.commit();
                }

                getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
            }
        };

        // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
        // per the navigation drawer design guidelines.
        if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
            mDrawerLayout.openDrawer(mFragmentContainerView);
        }

        // Defer code dependent on restoration of previous instance state.
        mDrawerLayout.post(new Runnable() {
            @Override
            public void run() {
                mDrawerToggle.syncState();
            }
        });

        mDrawerLayout.setDrawerListener(mDrawerToggle);
    }

    private void selectItem(int groupPosition) {
        selectItem(groupPosition, 0);
    }

    private void selectItem(int groupPosition, int childPosition) {
        mCurrentSelectedPosition = groupPosition;
        Log.i("SELECT", String.format("group #%d child #%d",groupPosition,childPosition));
        if (mDrawerListView != null) {
            //mDrawerListView.setItemChecked(groupPosition, true); // no use for expandable lists
        }
        if (mDrawerLayout != null) {
            mDrawerLayout.closeDrawer(mFragmentContainerView);
        }
        if (mCallbacks != null) {
            mCallbacks.onNavigationDrawerItemSelected(groupPosition, childPosition);
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mCallbacks = (NavigationDrawerCallbacks) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mCallbacks = null;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Forward the new configuration the drawer toggle component.
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        // If the drawer is open, show the global app actions in the action bar. See also
        // showGlobalContextActionBar, which controls the top-left area of the action bar.
        if (mDrawerLayout != null && isDrawerOpen()) {
            inflater.inflate(R.menu.global, menu);
            showGlobalContextActionBar();
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        /*
        if (item.getItemId() == R.id.action_example) {
            Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show();
            return true;
        }
        */
        return super.onOptionsItemSelected(item);
    }

    /**
     * Per the navigation drawer design guidelines, updates the action bar to show the global app
     * 'context', rather than just what's in the current screen.
     */
    private void showGlobalContextActionBar() {
        ActionBar actionBar = getActionBar();
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        actionBar.setTitle(R.string.app_name);
    }

    private ActionBar getActionBar() {
        return ((ActionBarActivity) getActivity()).getSupportActionBar();
    }

    /**
     * Callbacks interface that all activities using this fragment must implement.
     */
    public static interface NavigationDrawerCallbacks {
        /**
         * Called when an item in the navigation drawer is selected.
         */
        void onNavigationDrawerItemSelected(int groupPosition, int childPosition);
    }
}
